Good morning Rui,
I uploaded the files and it is better. Now I can empty the cart by clicking on the item counter, place zero in quantity and then pressing update cart.
Nevertheless, when trying to use the arrow quantity it does not go to zero.
I am saying this because still when pressing x the item does not remove itself.
I think one of the two above mentioned functionalities should at least work for the user.
If it helps, there is a plugin called “poor guys swiss knife”
https://wordpress.org/plugins/woocommerce-poor-guys-swiss-knife/
and there is an option there to empty the cart which works well with the cardinal.
So maybe it is similar to when removing a specific item.
Regards,
Nikos